Hayne Sharon, Kanovsky Naftali, Margel Shlomo
Department of Chemistry, Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel.
Biomimetics (Basel). 2024 Dec 12;9(12):756. doi: 10.3390/biomimetics9120756.
Developing a durable multifunctional superhydrophobic coating on polymeric films that can be industrially scalable is a challenge in the field of surface engineering. This article presents a novel method for a scalable technology using a simple single-step fabrication of a superhydrophobic coating on polymeric films that exhibits excellent water-repelling and UV-blocking properties, along with impressive wear resistance and chemical robustness. A mixture of titanium precursors, tetraethylorthosilicate (TEOS), hydrophobic silanes and silica nano/micro-particles is polymerized directly on a corona-treated polymeric film which reacts with the surface via siloxane chemistry. The mixture is then spread on polymeric films using a Mayer rod, which eliminates the need for expensive equipment or multistep processes. The incorporation of silica nanoparticles along with titanium precursor and TEOS results in the formation of a silica-titania network around the silica nanoparticles. This chemically binds them to the activated surface, forming a unique dual-scale surface morphology depending on the size of the silica nanoparticles used in the coating mixture. The coated films were shown to be superhydrophobic with a high water contact angle of over 180° and a rolling angle of 0°. This is due to the combination of dual-scale micro/nano roughness with fluorinated hydrocarbons that lowered the surface free energy. The coatings exhibited excellent chemical and mechanical durability, as well as UV-blocking capabilities. The results show that the coatings remain superhydrophobic even after a sandpaper abrasion test under a pressure of 2.5 kPa for a distance of 30 m.
在聚合物薄膜上开发一种可工业规模化的耐用多功能超疏水涂层是表面工程领域的一项挑战。本文提出了一种可扩展技术的新方法，该方法通过在聚合物薄膜上简单的一步法制备超疏水涂层，该涂层具有优异的拒水和紫外线阻挡性能，以及令人印象深刻的耐磨性和化学稳定性。钛前驱体、正硅酸乙酯（TEOS）、疏水性硅烷和二氧化硅纳米/微米颗粒的混合物直接在经电晕处理的聚合物薄膜上聚合，该薄膜通过硅氧烷化学与表面发生反应。然后使用迈耶棒将混合物铺展在聚合物薄膜上，这消除了对昂贵设备或多步工艺的需求。二氧化硅纳米颗粒与钛前驱体和TEOS的结合导致在二氧化硅纳米颗粒周围形成二氧化硅 - 二氧化钛网络。这将它们化学结合到活化表面上，根据涂层混合物中使用的二氧化硅纳米颗粒的尺寸形成独特的双尺度表面形态。涂覆的薄膜显示出超疏水性，水接触角高达180°以上，滚动角为0°。这是由于双尺度微/纳米粗糙度与氟化烃的结合降低了表面自由能。这些涂层表现出优异的化学和机械耐久性以及紫外线阻挡能力。结果表明，即使在2.5 kPa压力下进行30 m距离的砂纸磨损试验后，涂层仍保持超疏水性。
